rubocop: Naming/MethodParameterName: Add common short parameters names to AllowedNames

[root-expert]

Example:

def insync?(is)

That is parameter is all over the place in our modules.

[codecov]

Codecov Report

Merging #71 (13b9813) into master (8973588) will not change coverage.
The diff coverage is n/a.

❗ Current head 13b9813 differs from pull request most recent head 7f7e48b. Consider uploading reports for the commit 7f7e48b to get more accurate results

@@           Coverage Diff           @@
##           master      #71   +/-   ##
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  Coverage   27.86%   27.86%           
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  Files           2        2           
  Lines          61       61           
=======================================
  Hits           17       17           
  Misses         44       44           

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